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12 Magnet Dual Hall Pedal Assist Sensor (PAS Sensor) for electric bicycles. Two connector options: SM plug / 3Pin waterproof plug. Detects pedal rotation to trigger motor assist, simple installation without removing bottom bracket.
This dual hall pedal assist sensor (PAS) is a common replacement part for electric bicycles. It adopts a 12-magnet dual hall design, detects the rotation direction and cadence of pedal cranks, and sends pulse signals to the controller to activate motor power assist when you pedal forward. Stop pedaling or reverse pedaling will cut off the assist signal automatically.
| Parameter | Value |
|---|---|
| Product Name | 12 Magnet Dual Hall Pedal Assist Sensor (PAS) |
| Sensor Type | Dual Hall Effect, 12 Magnets |
| Housing Material | High-strength ABS |
| Cable Length | 100cm |
| Connector Options | SM 2P Plug / 3Pin Waterproof Plug |
| Wire Definition | Red: +5V Power; Black/Yellow: GND; White/Green: Signal |
| Installation | No need to disassemble bottom bracket |
The inner ring with magnets rotates together with the bottom bracket spindle, while the outer sensor shell is fixed to the frame.
✅ 12 Magnet Dual Hall Design: More stable signal compared with single hall sensors, less signal loss, smoother power assist.
✅ Two Connector Choices: SM plug and 3Pin waterproof plug available to match different ebike controllers.
✅ Easy Installation: No bottom bracket disassembly required. Snap the inner ring onto the spindle and fix the outer sensor to frame.
✅ Durable ABS Housing: Shockproof, dustproof and corrosion resistant, fits rough cycling environments.
✅ Wide Compatibility: Works with most hub motor and mid-drive ebike systems that support PAS pedal assist input.
✅ Repair Solution: Ideal spare part to repair faults such as missing pedal assist, delayed assist, intermittent power cut.
1 × 12 Magnet Dual Hall Pedal Assist Sensor
Great replacement spare part for ebike DIY conversion and repair shops to restore pedal assist function.
We specialize in mid-drive motors and e-bike parts. Strict testing, powerful R&D and flexible OEM service guarantee long-term cooperation.
It used to take me weeks to hunt down hard‑to‑find e‑bike spare parts. Their compatibility‑check technical support saved me countless repair headaches. Reliable supplier I can always count on.
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We supply genuine OEM parts and premium compatible aftermarket replacement parts for e-bikes, including motor components, controllers, throttles, PAS sensors, wiring harnesses, connectors and Bosch form-factor batteries.
We serve mainstream drive system manufacturers: Ananda, Bafang, Aikema, Tongsheng, Shengyi, Bosch and more. We also provide repair components for complete e-bike brands including Sur‑Ron, Aventon, Trek and many others.
All items are brand-new and inspected before shipment. We do not supply second-hand or refurbished goods.
Our team verifies compatibility according to your bike model, motor info or original part photos. We confirm available OEM parts or recommend workable alternative solutions.
Yes. Flexible order sizes are supported, ranging from single spare parts to bulk purchases.
Sea freight, air freight and rail transport are optional.
Lead time varies by item and shipping mode. We confirm exact timelines before each order and share tracking updates.
We provide part identification, model matching and full order follow-up support.
